﻿/*Employee 表包含所有员工信息，每个员工有其对应的工号 Id，姓名 Name，工资 Salary 和部门编号 DepartmentId 。

+----+-------+--------+--------------+
| Id | Name  | Salary | DepartmentId |
+----+-------+--------+--------------+
| 1  | Joe   | 85000  | 1            |
| 2  | Henry | 80000  | 2            |
| 3  | Sam   | 60000  | 2            |
| 4  | Max   | 90000  | 1            |
| 5  | Janet | 69000  | 1            |
| 6  | Randy | 85000  | 1            |
| 7  | Will  | 70000  | 1            |
+----+-------+--------+--------------+
Department 表包含公司所有部门的信息。

+----+----------+
| Id | Name     |
+----+----------+
| 1  | IT       |
| 2  | Sales    |
+----+----------+
编写一个 SQL 查询，找出每个部门获得前三高工资的所有员工。例如，根据上述给定的表，查询结果应返回：

+------------+----------+--------+
| Department | Employee | Salary |
+------------+----------+--------+
| IT         | Max      | 90000  |
| IT         | Randy    | 85000  |
| IT         | Joe      | 85000  |
| IT         | Will     | 70000  |
| Sales      | Henry    | 80000  |
| Sales      | Sam      | 60000  |
+------------+----------+--------+
*/

create table EmploSalary
(
   id int primary key not null identity,
   name varchar(50),
   salary int,
   department_id int
)
go 

create table Departments
(
   id int primary key not null identity,
   name varchar(50)
)

insert into EmploSalary(name , salary , department_id) values('Joe',85000,1)
insert into EmploSalary(name , salary , department_id) values('Henry',80000,2)
insert into EmploSalary(name , salary , department_id) values('Sam',60000,2)
insert into EmploSalary(name , salary , department_id) values('Max',90000,1)
insert into EmploSalary(name , salary , department_id) values('Janet',69000,1)
insert into EmploSalary(name , salary , department_id) values('Randy',85000,1)
insert into EmploSalary(name , salary , department_id) values('Will',70000,1)

insert into Departments values('IT')
insert into Departments values('Sales')

select ROW_NUMBER() over(partition by department_id order by salary desc) as row_index,* 
 from EmploSalary



select a.name as Department,b.name as Employee,b.salary as Salary from EmploSalary as b
inner join Departments as a on a.id = b.department_id 
where (
    select count(distinct Salary)
    from EmploSalary as c
    where b.department_id = c.department_id
    and c.Salary >= b.Salary
) <= 3
order by department_id,Salary desc
